21results about "Motor control for high speed" patented technology

A circular saw may include a base plate and a blade guard assembly coupled to the base plate, the blade guard assembly including an upper blade guard and a lower blade guard movable between an extended position and a retracted position. A circular saw may include a housing assembly coupled to a saw blade guard assembly, an output shaft, and a saw blade clamp coupled to the output shaft, the saw blade clamp configured to hold a saw blade. The circular saw may include a brushless direct current (DC) motor positioned within the housing assembly and operable to rotate the output shaft. The circular saw may include an electronic controller configured to perform a field weakening operation on the brushless DC motor.

Figure 4 shows peak torque capability CPTQ 110 of a torque generating machine (e.g. electric motor of a vehicle). A vehicle controller progressively limits the peak torque output CPTQ 110 of the torqu

The invention belongs to the technical field of motor control, relates to an energy consumption parameter optimization method and system of a permanent magnet motor, and is suitable for high-speed flux-weakening speed expansion area control of a high-power water-cooling permanent magnet servo motor. Three-phase current, bus voltage, winding temperature and cooling medium temperature of a stator are collected, direct-axis current is obtained through coordinate transformation, fundamental wave and high-frequency harmonic components are separated through variational mode decomposition, and a high-frequency harmonic thermal stress index is constructed; calculating a dynamic magnetic resistance saturation coefficient by combining the effective temperature difference; constructing a total power loss evaluation model containing a copper loss item, an iron loss item and a high-frequency additional loss item; and under the condition that the output torque requirement is met, the direct-axis current is optimized through an optimization algorithm by taking the minimum predicted total loss power as a target, and the direct-axis current is input into a controller. Accurate evaluation and control of the actual power loss of the permanent magnet motor under all working conditions are realized, and the operation energy consumption of a high-speed weak magnetic area is reduced.

The application discloses a motor control method, device and system, a motor and an electrical equipment, and belongs to the field of motor control. When a motor enters a field weakening control state, a bus voltage of a frequency converter for controlling the motor is acquired. If a bus voltage drop value in a unit time is detected to exceed a preset voltage value, it is indicated that the bus voltage drops too fast. At this time, if the frequency is directly reduced, the frequency reduction speed is relatively slow, the operating current increases too fast, overcurrent protection is triggered, and the system is shut down. Therefore, the application scheme first increases the carrier frequency of the frequency converter to a preset carrier frequency, and then switches an integral term in a control parameter of the motor to a value corresponding to the preset carrier frequency. In this way, when the frequency is reduced, the frequency reduction speed of the motor can be accelerated, the operating current is prevented from increasing too fast, overcurrent protection is not triggered in the process in which the motor reduces the frequency and exits the field weakening control state, and normal operation of the system is ensured.

A motor driving apparatus includes a motor having a plurality of windings, a dual inverter including a first inverter connected to first ends of the plurality of windings and a second inverter connected to second ends of the plurality of windings and configured to drive the motor through at least one of the first inverter or the second inverter according to a motor driving mode, and a controller configured to determine whether flux weakening control is performed according to an available voltage level of the dual inverter when a switching condition of the motor driving mode is satisfied and to perform the flux weakening control by linearly adjusting an output voltage level of the dual inverter for a preset time interval for which the flux weakening control is performed.

The invention relates to a method and a control device (2) for controlling a BLDC motor (3), which is controlled by means of a control unit (5) and power electronics (4), wherein the power electronics (4) includes several individual phases (x, y, z) of the BLDC motor (3), supplied by a predetermined supply voltage (U) from a DC voltage source (6), with power transistors and freewheeling diodes supplying voltage pulse widths according to specifications of the control unit (5), and wherein an intermediate circuit (7) with at least one intermediate circuit capacitor (8) is connected in parallel to the power electronics (4). In order to protect the power electronics (4), in particular the freewheeling diodes, during field weakening operation of the BLDC motor (3), the intermediate circuit (7) is disconnected from the supply voltage (U) during field weakening operation.

The invention discloses a method for calculating flux weakening control reference current of a permanent magnet motor, and the method comprises the steps: calculating a voltage constraint coefficient according to the voltage of a DC bus, the flux linkage of a permanent magnet and the maximum no-load rotation speed, and representing the voltage limitation degree of a high-speed region; the weak magnetic expected current is directly obtained according to the coefficient, and rapid analysis without additional control links is achieved; the weak magnetic current is corrected by combining the motor resistance and the operation current, so that the adaptability of a high-speed region is improved; and the flux weakening current range is automatically constrained through current amplitude limiting judgment, and the safe operation margin is ensured. Error accumulation of torque control reference current can be avoided, and the control precision of a weak magnetic region is remarkably improved; double mechanisms of dynamic compensation and amplitude limiting protection are adopted to adapt to complex working conditions of a high-speed area, and the anti-interference capability is excellent; an additional PI controller or a torque current calculation module is not needed, the real-time performance is high, and engineering implementation is facilitated; and the voltage constraint is accurately matched, the utilization efficiency of the DC bus voltage is maximized, and higher rotation speed expansion is supported.

The invention relates to a speed-adjustable fan which comprises a fan assembly, a speed adjusting unit and a control unit. The control unit adjusts the rotating speed of the fan assembly based on a signal generated by the speed adjusting unit, the signal generated by the speed adjusting unit is generated based on the operation mode of a user, and the operation mode comprises the operation distance, the operation speed and the operation frequency. By the adoption of the fan, accurate control over the air speed of the fan can be achieved, a user can flexibly adjust the air speed according to needs, and more comfortable use experience is obtained.

In one embodiment, electronic circuitry includes a driving circuit that is configured to: supply a driving current to a control terminal of a first switching element; and increase the driving current in accordance with a first time at which a current flowing through a second switching element connected to a first terminal or a second terminal of the first switching element becomes 0.

A field weakening control method based on rotor position angle adaptation includes the following steps: S1, the motor controller collects motor speed, motor torque, stator current, angular velocity of the motor in its natural coordinate system, and DC bus voltage of the motor controller in real time, and sets the threshold range of voltage deviation [ΔU]. min ,ΔU max S2, determine the current operating condition of the motor based on the motor speed and motor torque; S3, determine whether the voltage deviation between the DC bus voltage and the back electromotive force meets the requirements. If it meets the requirements, directly output the current requested direct-axis and quadrature-axis currents of the motor; if it does not meet the requirements, proceed to step S4; S4, perform adaptive control on the rotor position angle to make the voltage deviation between the DC bus voltage and the back electromotive force within the set threshold range; S5, redistribute the direct-axis and quadrature-axis currents of the motor based on the rotor position angle obtained after adaptive control; S6, the motor controller outputs the redistributed direct-axis and quadrature-axis currents.

The invention relates to a fan with a signal control function. The fan comprises a fan assembly, a speed regulation unit and a control unit. The control unit adjusts the rotating speed of the fan assembly based on the signal generated by the speed adjusting unit, the signal generated by the speed adjusting unit is generated based on the operation mode of a user, the operation mode comprises the operation distance and the operation speed, accurate control over the air speed of the fan can be achieved, and the user can flexibly adjust the air speed according to needs and obtain more comfortable use experience.

It is disclosed, among other things, a method for controlling an axle generator of a commercial vehicle, wherein the method is carried out by one or more devices, the method comprising: - controlling the axle generator or causing the axle generator to be controlled in order to adjust the torque of the axle generator to a target torque, wherein the target torque, when the axle generator is operated in field weakening mode, is less than the maximum torque of the axle generator for the current rotational speed of the axle generator.

The invention relates to the technical field of motor control, and discloses an 800V high-voltage platform new energy automobile motor voltage self-adaptive control method. The method comprises the steps of parameter initialization, multi-sensor data acquisition and verification, loss collaborative optimization, working condition adaptive modulation, driving signal generation and closed-loop optimization. Through establishing a SiC MOSFET junction temperature-loss quantification relation, the switching frequency and the dead time are dynamically adjusted, and a working condition hierarchical modulation technology and a harmonic suppression technology are combined, so that voltage self-adaptive control is realized. According to the method, the inverter efficiency is larger than or equal to 98.5%, the current harmonic distortion THD is smaller than or equal to 5%, the system operation fluctuation rate is smaller than or equal to 2%, the problems of low efficiency and power attenuation in the prior art are effectively solved, and the method is suitable for efficient and stable control over the 800V high-voltage platform new energy automobile motor.

To provide a battery-driven motor and a motor-driven system that achieve high output density without compromising overall system efficiency, a battery-driven motor is supplied electric power from a battery via an inverter to drive a load, wherein current supplied from the battery is 3.0 C or more when driven at maximum output, the battery-driven motor including a stator core (12) provided with an electrical steel sheet as an iron core material that has a magnetic flux density of 1.65 T or more at a magnetic field strength of 5,000 A / m and an iron loss of 40.0 W / kg or less under sinusoidal excitation of 1 kHz-1.0 T.

A power converter including: a non-boost rectifier circuit that converts a first alternating-current voltage into a direct-current voltage; a reactor connected to the rectifier circuit; a capacitor that smooths a direct-current voltage; an inverter that is connected in parallel to the capacitor, converts the smoothed direct-current voltage into a second alternating-current voltage having desired voltage and frequency, and outputs the second alternating-current voltage to a motor; and a controller that controls an operation of the inverter. Capacitances of the reactor and the capacitor are set such that a resonance frequency of a filter circuit including the reactor and the capacitor is smaller than a first electrical angular frequency based on a voltage command when the controller controls an operation of the inverter such that the second alternating-current voltage is maximized in a range not causing overmodulation.

A driving system of a driving motor is proposed. The system includes: a stator having slots at which coils are wound; a first inverter connected to first ends of the coils of the stator; a second inverter connected to second ends of the coils of the stator; and a stage switch circuit configured to control an electrical connection between the second ends of the coils of the stator and the second inverter. In particular, the coils include a first coil set connected to an output terminal of the first inverter, and a second coil set connected to an input terminal of the second inverter. Currents having the same phase or currents having different AC phases are applied to the first coil set and the second coil set wound at the slots by controlling on and off of the stage switch circuit.

The invention relates to a method for operating an electric drive (1), which has an electric machine (2), a power electronics system (3) having a plurality of half-bridges with semiconductor switches, and an intermediate circuit (5), and which is or can be connected to an electrical energy store (4), according to an operating state of the electric machine (2) and a required target torque of the electric machine (2), the semiconductor switch is switched to a normal operation for generating the target torque, to a short-circuit operation or to a freewheeling operation. According to the invention, a current operating value of the electric machine (2) is detected, said current operating value corresponding to a magnetic field weakening of a magnetic field of the electric machine (2), and the freewheeling operation is started or blocked depending on the operating value.

An electric motor comprises the following features: a rotor (100) with a first number of permanent magnets (101, 102, 103, 104), each permanent magnet comprising a first circular sector; a stator (200) with a second number of pole feet, each pole foot of the second number of pole feet having a coil wound around it, and each pole foot comprising a second circular sector smaller than the first circular sector, a first group of coils (301, 302, 303, 304) being electrically connected to one another via a first star point (311), a second group of coils (321, 322, 323, 324) being electrically connected to one another via a second star point (331), the second star point (331) being electrically insulated from the first star point (311), and a coil of the first group of coils being arranged between two coils of the second group of coils;and a control (500) for supplying the first group (301, 302, 303, 304) of coils with drive signals in order to provide the rotor (102) with a torque relative to the stator (200), and for supplying at least one coil (321, 322, 323, 324) of the second group of coils with a control signal that differs from the drive signals.

The invention relates to a method for operating an electric drive device (1) that comprises an electrical machine (2), power electronics (3) comprising half-bridges having multiple semiconductor switches and an intermediate circuit (5) and that is connected or connectable to an electrical energy store (4), wherein an operating state of the electrical machine (2) and a demanded target torque of the electrical machine (2) are taken as a basis for switching the semiconductor switches to a normal mode for generating the target torque, to a short-circuit mode or to a freewheeling mode. There is provision for a present operating value of the electrical machine (2), which corresponds to a magnetic field weakening of a magnetic field of the electrical machine (2), to be measured and for the freewheeling mode to be enabled or disabled on the basis of the operating value.

A motor driving apparatus driving a motor including a plurality of windings corresponding to each of phases, includes a mode change switch and a plurality of inverters that operate the motor in a closed end winding mode or an open end winding mode; and a controller configured for controlling the mode change switch and the plurality of inverters according to a first mode determination result based on a reverse magnetic flux and a second mode determination result according to an output power limit for each mode.

The application relates to the technical field of motor control, and discloses a voltage self-adaptive control method for an 800V high-voltage platform new energy vehicle motor. The method comprises the steps of parameter initialization, multi-sensor data acquisition and verification, loss coordination optimization, working condition self-adaptive modulation, drive signal generation and closed-loop optimization; by establishing a SiC MOSFET junction temperature-loss quantitative relationship, dynamically adjusting the switching frequency and the dead time, combining the working condition grading modulation and the harmonic suppression technology, the voltage self-adaptive control is realized. The application makes the inverter efficiency greater than or equal to 98.5%, the current harmonic distortion rate THD less than or equal to 5%, and the system operation fluctuation rate less than or equal to 2%, effectively solves the problems of low efficiency and power attenuation in the prior art, and is suitable for efficient and stable control of the 800V high-voltage platform new energy vehicle motor.